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Near field operation by use of Hardface probes

Posted by: Rolf Diederichs , E-mail: rd@ultrasonic.de, on September 02, 1996 at 10:41:00:

Hello Mr. Splitt,

Today is your day!
I hope you will get a lot of questions.
Sound propagation is part of our program, so I have a question about this.

Hardface probes are designed to operate in direct contact method.
The probes doesn't have inside a delay, actually they are immersion
probes providing a wear resistance protection layer.

The physics of sound beam showing that within the near field
many interferences, by means of maxima and minima of the sound preasure.

Because of this interferences I am concerned if this technique could be used.
My further questions are.

1. Can I do a proper flaw detection

2. Need the indications a special interpretation

3. Can I use it for wall thickness measurements with no problem

4. Could you explain something general about the nearfield operation, also with immersion
technique.

Thanks

Rolf


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